AMReX-Astro / AMReX-Astro/Castro
nonlinear elimination for radiation diffusion solve
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- Dominant language
- C++
- Stars
- 340
- Forks
- 105
- Avg merge
- 3d 8h
- Merged PRs (30d)
- 8
Description
For the radiation diffusion or moment equations, after discretizing in time, one can eliminating all variables in the radiation equations except the radiation energy density. After obtaining the radiation energy density from a multigrid solve, the eliminated variables (e.g., material energy) can be recovered independently in each cell via Newton iteration. This could potentially reduce the cost of the radiation solve significantly.
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the radiation diffusion or moment-equation implementation and read the cited OSTI paper to understand the proposed elimination and Newton recovery approach. Done would require a defined implementation, correctness validation, and evidence that it reduces the cost of the radiation solve.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- hpc
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100